Good effort.

It would be good to restart the game on R, that's always a good idea in any game jam game, and usually pretty straightforward in most game engines, and same thing restarting properly with the return to the main menu.

Keep practicing to improve your work efficiency so you can include sound too. Tools like BFXR make SFX production really quick and easy, but you can just download free sounds or record silly sounds from your mic as well. Same for music, there are lots of easy free AI tools like Suno and plenty of free music tracks you can download and throw into your games with usually a single line of code.

In terms of game design, in games like this the optimal player strategy is just to keep spamming the fire button. It would be great if you can figure out reasons why the player can't do that, like limited ammo, an overheat mechanic, losing points for missed shots, or charging stronger shots, etc.

Keep making games! I hope to see you make more in the future.